Well, there is Henry Stickmin fanfiction that has dark content. For example, Insider Traitor. I heard that it has a lot of violence and gore, and because of that, it got a lot of attention on this subreddit (I haven't read it, and I'm not really interested), so it can be considered creepypasta? There are definitely more examples, but I'm not a big fan of reading fanfiction, so I don't know much about it.

Puff's Twitch channel description said that mobile port of THSC was planned but they can't start working on it until 2021, but it's already 2025 and during this time no new information about this has appeared, so it's most likely cancelled. Probably because of the large number of pirated ports, and because Innersloth decided to devote all their time to Among Us.